There is an excellent article in the current issue of American Scientist on the importance of conserving the biodiversity (especially genetic diversity) of Pacific Northwest Salmon as opposed to just concentrating on total numbers of fish. I am posting this to both the general forum and the salmon forum because this issue is relevant to some degree to just about all of our fish stocks.
anyway, the article can be read online at:
http://www.sigmaxi.org/amsci/articles/01articles/Levin.html